Ajet aircraft with mass of 658,055 kilograms is flying straight downward. at an instant the plane's engine is producing an downward thrust (force) of 1,484,732.5 newtons and air resistance is exerting a force of 740,492.6 newtons upward. what is the acceleration of the plane in m/s2 at that instant?

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. the car goes up a 10-m highhill, then descends 15m to the track's lowest point. you'vedetermined that the spring can be compressed a maximum o 2.0m andthat a loaded car will have a maximum mass of 400kg. for safetyreasons, the spring constant should be 10% larger than the minimumneeded for the car to just make it over the top. a) what spring constant (k) should you specify ? b) what is the maximum speed of a 350 kg car if the spring iscompressed the full amount.